protected virtual void OnTimerTick(TimerEventArgs e)
{
// Make a temporary copy of the event to avoid possibility of
// a race condition if the last subscriber unsubscribes
// immediately after the null check and before the event is raised.
TimerTickEventHandler handler = TimerTick;
if (handler != null)
{
handler(this, e);
}
}
public async Task StartAsync(int numSeconds)
{
_isRunning = true;
while (numSeconds >= 0 && _isRunning)
{
TimerTickEventHandler?.Invoke(this, new TimerEventArgs(numSeconds));
await Task.Delay(1000); // one second tick
--numSeconds;
}
}
